Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 576 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
2. 2.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.Which of these is a pulley? (a) a flagpole rope wheel (b) a bottle opener (c) the tip of a nail (d) a steering wheel
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
6. 6.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
7. 7.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
8. 8.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
9. 9.True or false: pressing a doorbell is a pull. (a) True (b) False
10. 10.🏋️ A force of 140 N did 1400 J of work. How many metres did the object move?
11. 11.🏋️ A force of 460 N pushes a cart 5 m along the floor. How much work is done, in joules?
12. 12.True or false: a fishing rod is a class 2 lever (load in the middle). (a) False (b) True
13. 13.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.🏋️ Pushing a crate 6 m took 1020 J of work. What force was used, in newtons?
16. 16.True or false: a wet tiled floor gives less friction. (a) True (b) False
17. 17.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) gravity (c) friction (d) magnetic force
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.True or false: closing a drawer is a push. (a) False (b) True
20. 20.True or false: a movable pulley needs effort = load. (a) True (b) False
21. 21.🏋️ Pushing a crate 3 m took 780 J of work. What force was used, in newtons?
22. 22.🔍 Which is the odd one out? (a) an axe blade (b) a water tap handle (c) a chisel (d) a knife edge
23. 23.⚖️ A lever bar balances. The load is 490 N at 40 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Ravi (720 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
27. 27.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) friction (c) gravity (d) muscular force
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum
30. 30.Which of these is caused by gravity? (a) a thrown ball comes down (b) shoes grip the floor (c) brakes stop a bicycle (d) a rolling ball slows
31. 31.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a smaller rod (axle) (d) a loose rope
33. 33.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
36. 36.⚖️ A seesaw balances. Asha (520 N) sits 2 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) an apple falls down (c) a fridge magnet sticks (d) squeezing a lemon
38. 38.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
39. 39.True or false: a box pushed on carpet gives more friction. (a) True (b) False
40. 40.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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